What You're Looking At
This is a spin-on style diesel fuel filter that doubles as a water separator, sitting on the primary side of the fuel system before it hits the lift pump. It pulls water and coarse contamination out before fuel gets to the secondary filter and injectors.
Freightliner used this filter across a wide range of build years, so the A0000905051 number shows up on trucks with different engine combos. That's normal — the filter housing thread and seal design stayed consistent even as engines changed underneath it.
Bottom line: if the number on your old filter matches, you're good. If you're not sure, pull the filter and read the number off the housing rather than guessing by truck year.
Why These Numbers Cross
Fleetguard FS20083 and FS20385, and Donaldson P580710, all interchange with the Freightliner A0000905051 because they're built to the same thread pitch, seal ID/OD, and micron rating for this application. Filter manufacturers make the same physical part for multiple truck brands — Fleetguard and Donaldson supply OE lines to Freightliner, so their numbers land on the same filter with their own label.
Where guys get burned is assuming any 'diesel fuel filter' with similar dimensions will work. Micron rating matters here — too coarse and you're not protecting the injectors, too fine and you starve fuel flow, especially in cold weather with wax buildup. These specific numbers match the OE spec, not just the physical size.
Always confirm by the number stamped on your old filter or your VIN before you order. A0001485007 and A0000905051 are close but not always interchangeable depending on build date — don't rely on memory or a parts book that's a few years out of date.
Ordering From PartStop
We stock this filter in Tacoma and pull orders same-day for local fleets and owner-operators who need to keep trucks moving. If you're not in the area, we ship nationwide and most orders go out within 24 hours.
This is aftermarket, not a Freightliner dealer part, and we're upfront about that. It's built to the same spec numbers listed here and carries our 6+ month warranty if something's actually wrong with the filter itself — not if the wrong number got ordered.
If you're not 100% sure this crosses to your truck, call the counter with the VIN or a photo of the old filter's part number. Takes two minutes and saves you a return shipping label.
A0000905051 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to A0000905051. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Fleetguard | FS20083, FS20385 |
| Donaldson | P580710 |
| Freightliner | A485007, A0001485007 |
Frequently asked questions
Does A0000905051 fit my 2015 Cascadia?
Likely, but confirm by pulling the old filter and checking the number stamped on the housing, or give us the VIN. Freightliner ran this filter across several years and engine combos, so the VIN or old part number is the only sure way to know.
Is this the same as the Fleetguard FS20083?
Yes, FS20083 cross-references to this same filter — same thread, same seal dimensions, same micron rating. Fleetguard just puts their own label on the OE-spec part.
How do I know if I need this filter or the FS20385 instead?
Both cross to the A0000905051 application, but always match against the number on your old filter first. If your old filter says something different, that's your real cross-reference point, not the truck's model year.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.